After making some adjustments for missing data, the Chinese scientists
estimated the overall death rate to be 36 percent. The outbreak was
stopped after China closed many of its live animal markets — scientists
had assumed the virus was infecting people through exposure to live
That makes the new strain less deadly than H5N1, which kills about 70
percent of the people it infects. Still, H7N9 is more lethal than the
swine flu that caused a 2009 global epidemic. That had a death rate of
less than 1 percent.